Wine Explained

Yeast consumes the sugar in the grapes and converts it to ethanol and carbon dioxide. Different varieties of grapes and strains of yeasts produce different styles of wine. These variations result from the complex interactions between the biochemical development of the grape, the reactions involved in fermentation, the terroir, and the production process. Many countries enact legal appellations intended to define styles and qualities of wine. These typically restrict the geographical origin and permitted varieties of grapes, as well as other aspects of wine production. Wines not made from grapes include rice wine and fruit wines such as plum, cherry, pomegranate and elderberry.

History

See main article: History of wine. The earliest archaeological and archaeobotanical evidence for grape wine and viniculture, dating to 6000 - 5800 BC was found on the territory of modern Georgia.[18][19] Both archaeological and genetic evidence suggest that the earliest production of wine elsewhere was relatively later, likely having taken place in the Southern Caucasus (which encompasses Armenia, Georgia and Azerbaijan), or the West Asian region between Eastern Turkey, and northern Iran.[20][21]

A 2003 report by archaeologists indicates a possibility that grapes were mixed with rice to produce mixed fermented beverages in China in the early years of the seventh millennium BC. Pottery jars from the Neolithic site of Jiahu, Henan, contained traces of tartaric acid and other organic compounds commonly found in wine. However, other fruits indigenous to the region, such as hawthorn, cannot be ruled out.[27][28] If these beverages, which seem to be the precursors of rice wine, included grapes rather than other fruits, they would have been any of the several dozen indigenous wild species in China, rather than Vitis vinifera, which was introduced there 6000 years later.[27]

The spread of wine culture westwards was most probably due to the Phoenicians who spread outward from a base of city-states along the Mediterranean coast of what are today Syria, Lebanon, Israel, and Palestine.[29] The wines of Byblos were exported to Egypt during the Old Kingdom and then throughout the Mediterranean. Evidence includes two Phoenician shipwrecks from 750 BC discovered by Robert Ballard, whose cargo of wine was still intact.[30] As the first great traders in wine (cherem), the Phoenicians seem to have protected it from oxidation with a layer of olive oil, followed by a seal of pinewood and resin, similar to retsina.

Literary references to wine are abundant in Homer (8th century BC, but possibly relating earlier compositions), Alkman (7th century BC), and others. In ancient Egypt, six of 36 wine amphoras were found in the tomb of King Tutankhamun bearing the name "Kha'y", a royal chief vintner. Five of these amphoras were designated as originating from the king's personal estate, with the sixth from the estate of the royal house of Aten.[31] Traces of wine have also been found in central Asian Xinjiang in modern-day China, dating from the second and first millennia BC.[32]

The first known mention of grape-based wines in India is from the late 4th-century BC writings of Chanakya, the chief minister of Emperor Chandragupta Maurya. In his writings, Chanakya condemns the use of alcohol while chronicling the emperor and his court's frequent indulgence of a style of wine known as madhu.[33]

The ancient Romans planted vineyards near garrison towns so wine could be produced locally rather than shipped over long distances. Some of these areas are now world-renowned for wine production.[34] The Romans discovered that burning sulfur candles inside empty wine vessels kept them fresh and free from a vinegar smell.[35] In medieval Europe, the Roman Catholic Church supported wine because the clergy required it for the Mass. Monks in France made wine for years, aging it in caves.[36] An old English recipe that survived in various forms until the 19th century calls for refining white wine from bastard—bad or tainted bastardo wine.[37]

Ultimate Indo-European origin of the word is the subject of continued debate. Some scholars have noted the similarities between the words for wine in Indo-European languages (e.g. Armenian gini, Latin vinum, Ancient Greek οἶνος, Russian вино in Russian pronounced as /vʲɪˈno/), Kartvelian (e.g. Georgian ღვინო in Georgian pronounced as /ɣvinɔ/), and Semitic (*wayn; Hebrew יין in Hebrew pronounced as /jaiin/), pointing to the possibility of a common origin of the word denoting "wine" in these language families.[47] The Georgian word goes back to Proto-Kartvelian *ɣwino-,[48] which is either a borrowing from Proto-Indo-European[48][49][50][51][52][53] or the lexeme was specifically borrowed from Proto-Armenian *ɣʷeinyo-, whence Armenian gini.[54][55][56][57][48] An alternate hypothesis by Fähnrich supposes *ɣwino- a native Kartvelian word derived from the verbal root *ɣun- ('to bend').[58] See

ɣwino-

for more. All these theories place the origin of the word in the same geographical location, Trans-Caucasia, that has been established based on archeological and biomolecular studies as the origin of viticulture.

Variants

Red wine

See main article: Red wine. The red-wine production process involves extraction of color and flavor components from the grape skin. Red wine is made from dark-colored grape varieties. The actual color of the wine can range from violet, typical of young wines, through red for mature wines, to brown for older red wines. The juice from most purple grapes is actually greenish-white; the red color comes from anthocyan pigments (also called anthocyanins) present in the skin of the grape; exceptions are the relatively uncommon teinturier varieties, which actually have red flesh and produce red juice.

White wine

See main article: White wine. White wine can be straw-yellow, yellow-green, or yellow-gold.[59] Fermentation of the non-colored grape pulp produces white wine. The grapes from which white wine is produced are typically green or yellow. Some varieties are well-known, such as the Chardonnay, Sauvignon, and Riesling. Other white wines are blended from multiple varieties; Tokay, Sherry, and Sauternes are examples of these. Dark-skinned grapes may be used to produce white wine if the wine-maker is careful not to let the skin stain the wort during the separation of the pulp-juice. Pinot noir, for example, is commonly used to produce champagne.

Dry (non-sweet) white wine is the most common, derived from the complete fermentation of the wort. Sweet wines are produced when the fermentation is interrupted before all the grape sugars are converted into alcohol. Sparkling wines, which are mostly white wines, are produced by not allowing carbon dioxide from the fermentation to escape during fermentation, which takes place in the bottle rather than in the barrel.

Rosé wine

See main article: Rosé wine. A rosé wine incorporates some of the color from the grape skins, but not enough to qualify it as a red wine. It may be the oldest known type of wine, as it is the most straightforward to make with the skin contact method. The pink color can range from a pale orange to a vivid near-purple, depending on the varietals used and wine-making techniques. There are three primary ways to produce rosé wine: skin contact (allowing dark grape skins to stain the wort), saignée (removing juice from the must early in fermentation and continuing fermentation of the juice separately), and blending (uncommon and discouraged in most wine growing regions). Rosé wines can be made still, semi-sparkling, or sparkling, with a wide range of sweetness levels from dryProvençal rosé to sweet White Zinfandels and blushes. Rosé wines are made from a wide variety of grapes all over the world.[60][61]

Fruit wines

See main article: Fruit wine. Wines from other fruits, such as apples and berries, are usually named after the fruit from which they are produced combined with the word "wine" (for example, apple wine and elderberry wine) and are generically called fruit wine or country wine (not to be confused with the French term vin de pays). Other than the grape varieties traditionally used for wine-making, most fruits naturally lack either sufficient fermentable sugars, relatively low acidity, yeast nutrients needed to promote or maintain fermentation, or a combination of these three characteristics. This is probably one of the main reasons why wine derived from grapes has historically been more prevalent by far than other types, and why specific types of fruit wine have generally been confined to regions in which the fruits were native or introduced for other reasons.

Mead (honey wine)

See main article: Mead. Mead, also called honey wine, is created by fermenting honey with water, sometimes with various fruits, spices, grains, or hops. As long as the primary substance fermented is honey, the drink is considered mead.[62] Mead was produced in ancient history throughout Europe, Africa and Asia,[63] and was known in Europe before grape wine.[64]

Starch-based "wine" and wine-based products

Other beverages called "wine", such as barley wine and rice wine (e.g. sake), are made from starch-based materials and resemble beer more than traditional wine, while ginger wine is fortified with brandy. In these latter cases, the term "wine" refers to the similarity in alcohol content rather than to the production process.[65] The commercial use of the English word "wine" (and its equivalent in other languages) is protected by law in many jurisdictions.[66]

Some UK supermarkets have been criticised for selling “wine based” drinks, which only contain 75% wine, but which are still marketed as wine. The International Organisation of Vine and Wine requires that a "wine based drink" must contain a minimum of 75% wine, but producers do not have to divulge the nature of the remaining 25%.[67]

Hybridization is different from grafting. Most of the world's vineyards are planted with European V. vinifera vines that have been grafted onto North American species' rootstock, a common practice due to their resistance to phylloxera, a root louse that eventually kills the vine. In the late 19th century, most of Europe's vineyards (excluding some of the driest in the south) were devastated by the infestation, leading to widespread vine deaths and eventual replanting. Grafting is done in every wine-producing region in the world except in Argentina, the Canary Islands and Chile—the only places not yet exposed to the insect.[69]

In the context of wine production, terroir is a concept that encompasses the varieties of grapes used, elevation and shape of the vineyard, type and chemistry of soil, climate and seasonal conditions, and the local yeast cultures.[70] The range of possible combinations of these factors can result in great differences among wines, influencing the fermentation, finishing, and aging processes as well. Many wineries use growing and production methods that preserve or accentuate the aroma and taste influences of their unique terroir.[71] However, flavor differences are less desirable for producers of mass-market table wine or other cheaper wines, where consistency takes precedence. Such producers try to minimize differences in sources of grapes through production techniques such as micro-oxygenation, tannin filtration, cross-flow filtration, thin-film evaporation,and spinning cones.[72]

Some blended wine names are marketing terms whose use is governed by trademark law rather than by specific wine laws. For example, Meritage (sounds like "heritage") is generally a Bordeaux-style blend of Cabernet Sauvignon and Merlot, but may also include Cabernet Franc, Petit Verdot, and Malbec. Commercial use of the term Meritage is allowed only via licensing agreements with the Meritage Association.

European classifications

France has various appellation systems based on the concept of terroir, with classifications ranging from Vin de Table ("table wine") at the bottom, through Vin de Pays and Appellation d'Origine Vin Délimité de Qualité Supérieure (AOVDQS), up to Appellation d'Origine Contrôlée (AOC) or similar, depending on the region.[73][74] Portugal has developed a system resembling that of France and, in fact, pioneered this concept in 1756 with a royal charter creating the Demarcated Douro Region and regulating the production and trade of wine.[75] Germany created a similar scheme in 2002, although it has not yet achieved the authority of the other countries' classification systems.[76][77]Spain, Greece and Italy have classifications based on a dual system of region of origin and product quality.[78]

Beyond Europe

New World wines—those made outside the traditional wine regions of Europe—are usually classified by grape rather than by terroir or region of origin, although there have been unofficial attempts to classify them by quality.[79][80]

According to Canadian Food and Drug Regulations, wine in Canada is an alcoholic beverage that is produced by the complete or partial alcoholic fermentation of fresh grapes, grape must, products derived solely from fresh grapes, or any combination of them. There are many materials added during the course of the manufacture, such as yeast, concentrated grape juice, dextrose, fructose, glucose or glucose solids, invert sugar, sugar, or aqueous solutions. Calcium sulphate in such quantity that the content of soluble sulphates in the finished wine shall not exceed 0.2 per cent weight by volume calculated as potassium sulphate. Calcium carbonate in such quantity that the content of tartaric acid in the finished wine shall not be less than 0.15 per cent weight by volume. Also, sulphurous acid, including salts thereof, in such quantity that its content in the finished wine shall not exceed 70 parts per million in the free state, or 350 parts per million in the combined state, calculated as sulphur dioxide. Caramel, amylase and pectinase at a maximum level of use consistent with good manufacturing practice. Brandy, fruit spirit or alcohol derived from the alcoholic fermentation of a food source distilled to not less than 94 per cent alcohol by volume. Prior to final filtration may be treated with a strongly acid cation exchange resin in the sodium ion form, or a weakly basic anion exchange resin in the hydroxyl ion form.[81]

Vintages

See main article: Vintage. In the United States, for a wine to be vintage-dated and labeled with a country of origin or American Viticultural Area (AVA; e.g., Sonoma Valley), 95% of its volume must be from grapes harvested in that year.[82] If a wine is not labeled with a country of origin or AVA the percentage requirement is lowered to 85%.[82]

Vintage wines are generally bottled in a single batch so that each bottle will have a similar taste. Climate's impact on the character of a wine can be significant enough to cause different vintages from the same vineyard to vary dramatically in flavor and quality.[83] Thus, vintage wines are produced to be individually characteristic of the particular vintage and to serve as the flagship wines of the producer. Superior vintages from reputable producers and regions will often command much higher prices than their average ones. Some vintage wines (e.g. Brunello), are only made in better-than-average years.

For consistency, non-vintage wines can be blended from more than one vintage, which helps wine-makers sustain a reliable market image and maintain sales even in bad years.[84][85] One recent study suggests that for the average wine drinker, the vintage year may not be as significant for perceived quality as had been thought, although wine connoisseurs continue to place great importance on it.[86]

Tasting

See also: Wine tasting descriptors. Wine tasting is the sensory examination and evaluation of wine. Wines contain many chemical compounds similar or identical to those in fruits, vegetables, and spices. The sweetness of wine is determined by the amount of residual sugar in the wine after fermentation, relative to the acidity present in the wine. Dry wine, for example, has only a small amount of residual sugar. Some wine labels suggest opening the bottle and letting the wine "breathe" for a couple of hours before serving, while others recommend drinking it immediately. Decanting (the act of pouring a wine into a special container just for breathing) is a controversial subject among wine enthusiasts. In addition to aeration, decanting with a filter allows the removal of bitter sediments that may have formed in the wine. Sediment is more common in older bottles, but aeration may benefit younger wines.[87]

During aeration, a younger wine's exposure to air often "relaxes" the drink, making it smoother and better integrated in aroma, texture, and flavor. Older wines generally fade (lose their character and flavor intensity) with extended aeration.[88] Despite these general rules, breathing does not necessarily benefit all wines. Wine may be tasted as soon as the bottle is opened to determine how long it should be aerated, if at all.[89] When tasting wine, individual flavors may also be detected, due to the complex mix of organic molecules (e.g. esters and terpenes) that grape juice and wine can contain. Experienced tasters can distinguish between flavors characteristic of a specific grape and flavors that result from other factors in wine-making. Typical intentional flavor elements in wine—chocolate, vanilla, or coffee—are those imparted by aging in oak casks rather than the grape itself.[90]

Vertical and horizontal tasting involves a range of vintages within the same grape and vineyard, or the latter in which there is one vintage from multiple vineyards. "Banana" flavors (isoamyl acetate) are the product of yeast metabolism, as are spoilage aromas such as "medicinal" or "Band-Aid" (4-ethylphenol), "spicy" or "smoky" (4-ethylguaiacol),[91] and rotten egg (hydrogen sulfide).[92] Some varieties can also exhibit a mineral flavor due to the presence of water-soluble salts as a result of limestone's presence in the vineyard's soil. Wine aroma comes from volatile compounds released into the air.[93] Vaporization of these compounds can be accelerated by twirling the wine glass or serving at room temperature. Many drinkers prefer to chill red wines that are already highly aromatic, like Chinon and Beaujolais.[94]

The ideal temperature for serving a particular wine is a matter of debate by wine enthusiasts and sommeliers, but some broad guidelines have emerged that will generally enhance the experience of tasting certain common wines. A white wine should foster a sense of coolness, achieved by serving at "cellar temperature" (13C). Light red wines drunk young should also be brought to the table at this temperature, where they will quickly rise a few degrees. Red wines are generally perceived best when served chambré ("at room temperature"). However, this does not mean the temperature of the dining room—often around (21C)—but rather the coolest room in the house and, therefore, always slightly cooler than the dining room itself. Pinot noir should be brought to the table for serving at (16C) and will reach its full bouquet at (18C). Cabernet Sauvignon, zinfandel, and Rhone varieties should be served at (18C) and allowed to warm on the table to 21C for best aroma.[95]

Collecting

See also: Aging of wine, Investment wine and Storage of wine. Outstanding vintages from the best vineyards may sell for thousands of dollars per bottle, though the broader term "fine wine" covers those typically retailing in excess of US$30–50.[96] "Investment wines" are considered by some to be Veblen goods: those for which demand increases rather than decreases as their prices rise.Particular selections have higher value, such as "Verticals", in which a range of vintages of a specific grape and vineyard, are offered. The most notable was a Château d'Yquem 135 year vertical containing every vintage from 1860 to 2003 sold for $1.5 million.The most common wines purchased for investment include those from Bordeaux and Burgundy; cult wines from Europe and elsewhere; and vintage port. Characteristics of highly collectible wines include:

A proven track record of holding well over time

A drinking-window plateau (i.e., the period for maturity and approachability) that is many years long

A consensus among experts as to the quality of the wines

Rigorous production methods at every stage, including grape selection and appropriate barrel aging

Investment in fine wine has attracted those who take advantage of their victims' relative ignorance of this wine market sector.[97] Such wine fraudsters often profit by charging excessively high prices for off-vintage or lower-status wines from well-known wine regions, while claiming that they are offering a sound investment unaffected by economic cycles. As with any investment, thorough research is essential to making an informed decision.

Consumption

Wine-consumption data from a list of countries by alcohol consumption measured in liters of pure ethyl alcohol consumed per capita in a given year, according to the most recent data from the World Health Organization. The methodology includes persons 15 years of age or older.[102]

Wine consumption

Country

Liters per capita

8.14

6.65

6.38

5.80

5.69

5.10

5.10

4.94

4.67

4.62

Wine vs. beer consumption per capita

Country

Wine (l)

Beer (l)

Wine/beer ratio

4.18

0.45

9.29

6.38

1.73

3.69

8.14

2.31

3.52

3.92

1.12

3.50

3.40

1.12

3.04

3.95

1.33

2.97

2.29

0.89

2.57

4.51

2.20

2.05

4.62

2.49

1.86

6.65

3.75

1.77

Culinary uses

Wine is a popular and important beverage that accompanies and enhances a wide range of cuisines, from the simple and traditional stews to the most sophisticated and complex haute cuisines. Wine is often served with dinner. Sweet dessert wines may be served with the dessert course. In fine restaurants in Western countries, wine typically accompanies dinner. At a restaurant, patrons are helped to make good food-wine pairings by the restaurant's sommelier or wine waiter. Individuals dining at home may use wine guides to help make food–wine pairings. Wine is also drunk without the accompaniment of a meal in wine bars or with a selection of cheeses (at a wine and cheese party).

Wine is important in cuisine not just for its value as a beverage, but as a flavor agent, primarily in stocks and braising, since its acidity lends balance to rich savory or sweet dishes.[103]Wine sauce is an example of a culinary sauce that uses wine as a primary ingredient.[104] Natural wines may exhibit a broad range of alcohol content, from below 9% to above 16% ABV, with most wines being in the 12.5–14.5% range.[105]Fortified wines (usually with brandy) may contain 20% alcohol or more.

Judaism

See main article: Kosher wine. Wine is an integral part of Jewish laws and traditions. The Kiddush is a blessing recited over wine or grape juice to sanctify the Shabbat. On Pesach (Passover) during the Seder, it is a Rabbinic obligation of adults to drink four cups of wine.[106] In the Tabernacle and in the Temple in Jerusalem, the libation of wine was part of the sacrificial service.[107] Note that this does not mean that wine is a symbol of blood, a common misconception that contributes to the Christian myth of the blood libel."It has been one of history's cruel ironies that the blood libel—accusations against Jews using the blood of murdered gentile children for the making of wine and matzot—became the false pretext for numerous pogroms. And due to the danger, those who live in a place where blood libels occur are halachically exempted from using red wine, lest it be seized as "evidence" against them."[108]

While some Christians consider the use of wine from the grape as essential for the validity of the sacrament, many Protestants also allow (or require) pasteurized grape juice as a substitute. Wine was used in Eucharistic rites by all Protestant groups until an alternative arose in the late 19th century. Methodistdentist and prohibitionist Thomas Bramwell Welch applied new pasteurization techniques to stop the natural fermentation process of grape juice. Some Christians who were part of the growing temperance movement pressed for a switch from wine to grape juice, and the substitution spread quickly over much of the United States, as well as to other countries to a lesser degree.[109] There remains an ongoing debate between some American Protestant denominations as to whether wine can and should be used for the Eucharist or allowed as an ordinary beverage, with Catholics and some mainline Protestants allowing wine drinking in moderation, and some conservative Protestant groups opposing consumption of alcohol altogether.

Islam

Alcoholic beverages, including wine, are forbidden under most interpretations of Islamic law.[110] In many Muslim countries, possession or consumption of alcoholic beverages carry legal penalties. Iran had previously had a thriving wine industry that disappeared after the Islamic Revolution in 1979.[111] In Greater Persia, mey (Persian wine) was a central theme of poetry for more than a thousand years, long before the advent of Islam. Some Alevi sects–one of the two main branches of Islam in Turkey (the other being Sunni Islam)–use wine in their religious services.

Certain exceptions to the ban on alcohol apply. Alcohol derived from a source other than the grape (or its byproducts) and the date[112] is allowed in "very small quantities" (loosely defined as a quantity that does not cause intoxication) under the Sunni Hanafimadhab, for specific purposes (such as medicines), where the goal is not intoxication. However, modern Hanafi scholars regard alcohol consumption as totally forbidden.[113]

Health effects

Short-term effects

See main article: Short-term effects of alcohol. Wine contains ethyl alcohol, the same chemical that is present in beer and distilled spirits and as such, wine consumption has short-term psychological and physiological effects on the user. Different concentrations of alcohol in the human body have different effects on a person. The effects of alcohol depend on the amount an individual has drunk, the percentage of alcohol in the wine and the timespan that the consumption took place, the amount of food eaten and whether an individual has taken other prescription, over-the-counter or street drugs, among other factors. Drinking enough to cause a blood alcohol concentration (BAC) of 0.03%-0.12% typically causes an overall improvement in mood and possible euphoria, increased self-confidence and sociability, decreased anxiety, a flushed, red appearance in the face and impaired judgment and fine muscle coordination. A BAC of 0.09% to 0.25% causes lethargy, sedation, balance problems and blurred vision. A BAC from 0.18% to 0.30% causes profound confusion, impaired speech (e.g. slurred speech), staggering, dizziness and vomiting. A BAC from 0.25% to 0.40% causes stupor, unconsciousness, anterograde amnesia, vomiting, and death may occur due to inhalation of vomit (pulmonary aspiration) while unconscious and respiratory depression (potentially life-threatening). A BAC from 0.35% to 0.80% causes a coma (unconsciousness), life-threatening respiratory depression and possibly fatal alcohol poisoning. As with all alcoholic beverages, drinking while driving, operating an aircraft or heavy machinery increases the risk of an accident; many countries have penalties against drunk driving.

Wines can trigger the positive emotions in a short period of time, such as relaxed and comfortable. The context and quality of wine can affect the mood and emotions, too. [114]

Long-term effects

The main active ingredient of wine is alcohol, and therefore, the health effects of alcohol apply to wine. Some studies have concluded that drinking small quantities of alcohol (less than one drink in women and two in men) is associated with a decreased risk of heart disease, stroke, diabetes mellitus, and early death.[115] Some of these studies lumped former ethanol drinkers and life-long abstainers into a single group of nondrinkers, hiding the health benefits of life-long abstention from ethanol. A 2016 systematic review and meta-analysis found that moderate ethanol consumption brought no mortality benefit compared with lifetime abstention from ethanol consumption.[116] Drinking more than this amount actually increases the risk of heart disease, high blood pressure, atrial fibrillation, and stroke.[115] Risk is greater in younger people due to binge drinking which may result in violence or accidents.[115] About 3.3 million deaths (5.9% of all deaths) are believed to be due to alcohol each year.[117]

Alcoholism is a broad term for any drinking of alcohol that results in problems.[118] It was previously divided into two types: alcohol abuse and alcohol dependence.[119][120] In a medical context, alcoholism is said to exist when two or more of the following conditions is present: a person drinks large amounts over a long time period, has difficulty cutting down, acquiring and drinking alcohol takes up a great deal of time, alcohol is strongly desired, usage results in not fulfilling responsibilities, usage results in social problems, usage results in health problems, usage results in risky situations, withdrawal occurs when stopping, and alcohol tolerance has occurred with use.[120] Alcoholism reduces a person's life expectancy by around ten years[121] and alcohol use is the third leading cause of early death in the United States.[115] No professional medical association recommends that people who are nondrinkers should start drinking wine.[115][122]

Although lower quality evidence suggest a cardioprotective effect, no controlled studies have been completed on the effect of alcohol on the risk of developing heart disease or stroke. Excessive consumption of alcohol can cause liver cirrhosis and alcoholism.[123] The American Heart Association "cautions people NOT to start drinking ... if they do not already drink alcohol. Consult your doctor on the benefits and risks of consuming alcohol in moderation."[124]

Population studies exhibit a J-curve correlation between wine consumption and rates of heart disease: heavy drinkers have an elevated rate, while people who drink small amount (up to 20 g of alcohol per day, approximately 200ml of 12.7% ABV wine) have a lower rate than non-drinkers. Studies have also found that moderate consumption of other alcoholic beverages is correlated with decreased mortality from cardiovascular causes,[125] although the association is stronger for wine. Additionally, some studies have found a greater correlation of health benefits with red than white wine, though other studies have found no difference. Red wine contains more polyphenols than white wine, and these could be protective against cardiovascular disease.[126]

Although red wine contains the chemical resveratrol and there is tentative evidence it may improve heart health, the evidence is unclear for those at high risk .[127] Grape skins naturally produce resveratrol in response to fungal infection, including exposure to yeast during fermentation. White wine generally contains lower levels of the chemical as it has minimal contact with grape skins during this process.[128]

Forgery and manipulation

See also: List of food contamination incidents. Incidents of fraud, such as mislabeling the origin or quality of wines, have resulted in regulations on labeling. "Wine scandals" that have received media attention include:

Some wines are packaged in thick plastic bags within corrugated fiberboard boxes, and are called "box wines", or "cask wine". Tucked inside the package is a tap affixed to the bag in box, or bladder, that is later extended by the consumer for serving the contents. Box wine can stay acceptably fresh for up to a month after opening because the bladder collapses as wine is dispensed, limiting contact with air and, thus, slowing the rate of oxidation. In contrast, bottled wine oxidizes more rapidly after opening because of the increasing ratio of air to wine as the contents are dispensed; it can degrade considerably in a few days.

Environmental considerations of wine packaging reveal benefits and drawbacks of both bottled and box wines. The glass used to make bottles is a nontoxic, naturally occurring substance that is completely recyclable, whereas the plastics used for box-wine containers are typically much less environmentally friendly. However, wine-bottle manufacturers have been cited for Clean Air Act violations. A New York Times editorial suggested that box wine, being lighter in package weight, has a reduced carbon footprint from its distribution; however, box-wine plastics, even though possibly recyclable, can be more labor-intensive (and therefore expensive) to process than glass bottles. In addition, while a wine box is recyclable, its plastic bladder most likely is not.[134]

Storage

Wine cellars, or wine rooms, if they are above-ground, are places designed specifically for the storage and aging of wine. Fine restaurants and some private homes have wine cellars. In an active wine cellar, temperature and humidity are maintained by a climate-control system. Passive wine cellars are not climate-controlled, and so must be carefully located. Because wine is a natural, perishable food product, all types—including red, white, sparkling, and fortified—can spoil when exposed to heat, light, vibration or fluctuations in temperature and humidity. When properly stored, wines can maintain their quality and in some cases improve in aroma, flavor, and complexity as they age. Some wine experts contend that the optimal temperature for aging wine is 13C,[135] others 15C.[136]

Wine refrigerators offer a smaller alternative to wine cellars and are available in capacities ranging from small, 16-bottle units to furniture-quality pieces that can contain 400 bottles. Wine refrigerators are not ideal for aging, but rather serve to chill wine to the proper temperature for drinking. These refrigerators keep the humidity low (usually under 50%), below the optimal humidity of 50% to 70%. Lower humidity levels can dry out corks over time, allowing oxygen to enter the bottle, which reduces the wine's quality through oxidation.[137] While some types of alcohol are sometimes stored in freezer, such as vodka, it is not possible to safely freeze wine in the bottle, as there is insufficient room for it to expand as it freezes and the bottle will usually crack. Certain shapes of bottle may allow the cork to be pushed out by the ice, but if the bottle is frozen on its side, the wine in the narrower neck will invariably freeze first, preventing this.

Professions

There are a large number of occupations and professions that are part of the wine industry, ranging from the individuals who grow the grapes, prepare the wine, bottle it, sell it, assess it, market it and finally make recommendations to clients and serve the wine.

A wine scientist or wine chemist; a student of oenology. In the 2000s, B.Sc. degrees in oenology and viticulture are available. A wine-maker may be trained as an oenologist, but often hires one as a consultant

Also called a "wine steward", this is a specialist wine expert in charge of developing a restaurant's wine list, educating the staff about wine, and assisting customers with their selections (especially food-wine pairings)

Book: Hornsey, Ian. A History of Beer and Brewing. Royal Society of Chemistry. 2003. 7. 0-85404-630-5. ...mead was known in Europe long before wine, although archaeological evidence of it is rather ambiguous. This is principally because the confirmed presence of beeswax or certain types of pollen ... is only indicative of the presence of honey (which could have been used for sweetening some other drink) – not necessarily of the production of mead..